Store file size/orientation data in sessionStorage #5451
Description
File text size, image zoom level, image orientation is stored on the window (as of #5413).
Preferably, we should store this info in sessionStorage (lasts for the duration of the session) or localStorage (lasts until cleared).
(We should not set these values in a react component's state. Doing so would overly-complicate the code and would not provide any functional advantage to storing this information on the window.)